20131070 Ver 1_More Info Received_20140210

June 10, 2002
Ms. Karen Higgins
WBSCB Unit
1650 Mail Service Center
Raleigh, NC 27699 -1650
RE: Elk Creek at Banner Elk, Avery County
DWQ # 2013 -1070 USACE Action ID No 2013 -02213
Dear Ms. Higgins:
3764 Rominger Road
Banner Elk, NC 28604
Ph: 828- 297 -6946
e -mail: john @env- ecs.com
The purpose of this letter is to provide the additional information requested in a November 20, 2013
letter from G. Landon Davidson, PG to Mr. Accetturo (Applicant) and Mr. Vilas (Consultant). Each item
raised in Mr. Davidson's letter will be addressed sequentially below:
1. Avoidance and Minimization of Wetland Impacts: It is important to emphasize that the current
project is a continuation of a project initiated by other in the early to mid- 2000's. The original
developer had installed the roads, utilities, plated the single family residential lots, obtained
approval for and constructed two condominium buildings (two units each), and performed
preliminary grading for the cottage area. It is within this cottage area that all of the wetland
impacts referenced are proposed to occur. The proposed project is in keeping with the original
plan initiated by the previous developer and the current Applicant purchased the project with
the reasonable expectation of completing the project as it was originally intended. The area of
the proposed wetland impacts is well suited for and was planned as a clustered cottage area.
The previous developer did a substantial amount of grading in these areas leaving some
distinct low areas, which contain the delineated wetlands. As stated in the original PCN, it is
not clear if these areas were wetlands before the area was graded by the previous developer.
Analysis of old aerial photographs appears to show the area was a Christmas tree farm. The
proposed plan requires that the low areas be filled in order to create a reasonably level area
upon which to build roads, parking, sidewalks and cottage units. In the vicinity of wetland units
#1 and #4, the site is to be filled between 4 and 6 feet and impacts could not be avoided.
Wetland unit 3 will be preserved intact and approximately 2/3 of wetland unit #3 will be
preserved. One cottage unit and associated parking was eliminated to reduce impacts to
wetland unit #3.
2. Stormwater Management BMP Issues: Revised Stormwater Management Plans are attached
along with calculations:
a. Design Change: The sand filter BMP has now been replaced with a wet detention
basin. A combination of factors led to this change including cost, high water table,
ability to treat all the stormwater with one measure, ability to satisfy both local
stormwater quantity requirements and state stormwater quality requirements with one
measure, and cost.
b. The Town of Banner Elk Zoning Ordinance requires pre -post management of the 10-
yr 24 hour storm, the engineer has determined that this detention volume is contained
in the temporary storage of the proposed wet detention pond and no additional
storage is needed above that needed to meet state water quality standards.
c. Basin O &M form submitted previously
d. See Wet Detention Supplement Form attached.
e. Forebays are now included for both basin inflow locations.

• page 2 February 10, 2014
f. Sand filter eliminated NA
g. Sand filter eliminated NA
h. Full sized plan sheets will now be submitted
i. Calculations are now included
j. BMP design has changed and should now provide better protection to downstream
trout waters.
If you have any questions regarding this information please call me at 828 - 297 -6946, thank you.
Sincerely,
C
ACS
John . vlas
President, EW Environmental Consulting Services Inc.
Cc: David Ramsey, PE,
Tim Fox, NC DWR
Boyd Devane, NC DWR
Angelo Accetturo

Permit No.
(to be Provided by 0")
H=HR °
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
Tiffs form must be filled out printed and submitted.
The Required Hems Checklist (Part 110 must be printed, filled out and submdted along with all of the required information.
1. Plti.0 Ii;iTll
Project name Elk Creek at Banter Elk
Contact person John via Xn'ROnn David Ramsey (Ertgmeer)
Phone number 825-M4"
Date 2172014
Drainage area number #1 entire aft
A. 1�l�IF ©RMA'iliNN
ft'
Site Characteristics
t
Drainage area
327.757 fie
Impervious area, post - development
132,717 fe
o% impervious
40.49 %
Design rainfall depth
1.0 in
Storage Volume: Non -SA Waters
Minimum volume required 11,320 fe
Volume provided 12,606 tt'
OK, volume provided is equal to or in excess of volume required
Storage Volume: SA Waters
1.5° runoff volume
ft'
Pre, development 1 -yr, 24-hr runoff
t
Post - development 1-yr, 24-hr runoff
ft'
Minimum volume required
ft'
Volume provided I
Peak Flow Calculations
Is the pre/post control of the 1 y 24hr storm peak flow required?
n (Y or N)
1 -yr, 24-hr rainfall depth
in
Rational C, pre - development
(unitless)
Rational C, post - development
(unitless)
Rainfall intensity: 1 -yr, 24-hr storm
in/hr
Pre-development 1 -yr, 24-hr peak flow
ft'/sec
Post - development 1 -yr, 24-hr peak flow
ft' /sec
Pre/Post 1 -yr, 24-hr peak flow control
ft' /sec
Elevations
Temporary pod elevation
3677.00 frrrsl
Permanent pool elevation
3675.00 imsi
SHWT elevation (approx. at the perm. pod elevation)
3674.50 fmsl
Top of 1 Oft vegetated shelf elevation
3675.50 imsl
Bottom of 10ft vegetated shelf elevation
3674.50 fmsl
Sediment deanout, top elevation (bottom of pond)
3671.00 fmsl
Sediment deanout, bottom elevation
3670.00 final
Sediment storage provided
1.00 ft
Is there additional volume stored above the state - required temp. pool?
n (Y or N)
Elevation of the top of the additional volume
fmsl
Form SW401 -Wet Detention Basin- Rev.9- 4/18/12 Parts I. & H. Design Summary, Page 1 of 2

H. DES t1M►t1
Surface Areas
Area, temporary pool
7257 fe
Area REQUIRED, permanent pool
5,670 fe
SAIDA ratio
1.73 ( unitless)
Area PROVIDED, permanent pool, Ap.,„_,W
4,287 fl?
Area, bottom of 10ft vegetated shelf, Abt_,hw
2,151 ft'
Area, sediment c learwut, top elevation (bottom of pond), Abdo
626 ft�
Volumes
Volume, temporary pool
12,606 ft
Volume, permanent pool, Vp m_pw
8,412 fe
Volume, forebay (sum of forebays if more than one forebay)
2,591 fe
Forebay % of permanent pool volume
30.8% %
SAIDA Table Data
Design TSS removal
85%
Coastal SAIDA Table Used?
N (Y or N)
WuntairdPiedmont SAIDA Table Used?
Y (Y or N)
SAIDA ratio
1.73 (unitless)
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10 -2b)
N (Y or N)
Volume, permanent pool, V,.m w
81412 fe
Area provided, permanent pool, Ap._pw
4,287 if
Average depth calculated
It
Average depth used in SAIDA, d.„ (Round to nearest 0.511t)
It
Calculation option 2 used? (See Figure 10 -2b)
Y (Y or N)
Area provided, permanent pool, Ap m_pw
4,287 fe
Area, bottom of 1Oft vegetated shelf, Ab� hw
2,151 fe
Area, sediment cleanout, top elevation (bottom of pond), Pw_pord 626 fe
"Depth' (distance b/w bottom of 10ft shelf and top of sediment) 3.50 It
Average depth calculated 3.00 it
Average depth used in SAIDA, d.„ (Round to down to nearest 0.5ft) 3.0 ft
Drawdown Calculations
Drawdown through orifice?
Diameter of orifice (if circular)
Area of orifice ('If- non - circular)
Coefficient of discharge (Co)
Driving head (H,)
Drawdown through weir?
Weir type
Coefficient of discharge (G,)
Length of weir (L)
Driving head (H)
Pre - development 1 -yr, 24-hr peak flow
Post-development 1 -yr, 24-hr peak flow
Storage volume discharge rate (through discharge orifice or weir)
Storage volume drawdown time
Additional Information
Vegetated side slopes
Vegetated shelf slope
Vegetated shelf width
Length of fknwpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build -out?
Drain mechanism for maintenance or emergencies is:
Y (Y or N)
in
5.90 in,
0.40 (unitless)
0.75 ft
N (Y or N)
(unitless)
( unitless)
ft
ft
11PIsac
ft' /sec
ft /sec
2.00 days
3 :1
10 :1
10.0 ft
2 :1
2.0 :1
Y (Y or N)
1.0 ft
N (Yor N)
N (Yor N)
Y (Yor N)
Permit No.
(to be provided by DM)
Insufficient permanent pool surface area
OK
Insufficient forebay volume.
Need 3 it min.
OK
OK
OK, draws down in 2 -5 days.
OK
OK
OK
Insufficient flow path to width ratio. Must not short- circuit pond.
OK
OK
OK
Insufficient. Vegetated filter required.
Insufficient. Recorded drainage easement required.
OK
Form SW401 -Wet Detention Basin- Rov.9- 4!18112 Parts I. & II. Design Summary, Page 2 of 2

2/10/2014
SUPPORTING CALCULATIONS for Wet
Detention Basin
Project I
Elk Creek of Banner Elk
Date:
219/2014
Peak Elow Calculations
Developed Portion of Project Site all area draining to wet and
DA 1 7.524
developed area
Peak Flow: Q =CIA
Tc = 5 min.
C=
0.483
1 buildin arking w/landsca in
1 -10 =
7.5
in/hr
1 -25 =
8.59
in/hr
A =
7.524
acres
Q -10 =
27.26
cis
Q -25
31.217
cis
Totals
Q -10 = 16.1 cis
Q -25 =18.5 cis
Pollutant
Removal
Calcs: Bioretention
use sim le method
Site
DAs .ft.
DA -ac
IA s .ft.
IA-ac
1%
RV
WQ vol cu.ft.
total
327757
7.52
132717.00
3.05
0.40
0.41
11319.43
Pond SlAna
Calculations
site
WQ vol
WQ vol
Max Depth
Avg Depth
required
provided
cu-ft
cu -ft
ft
ft
WP
11319
12606
4
3
incl
foreba
Ele
Area
Use
3677
7258
yes
top of tern stora e
3676
6303
yes
3675.5
4333
no
top of littoral shelf
3675
4287
yes
top of Perm. pool bottom temp storage)
3674.5
2151
no
3674
1884
no
3673
1398
no
3672
978
no
3671
626
no
bottom Perm pool. top sed storage
3670
339
no
bottom of sed
storage
Elk Creek at Banner Elk Page 1 Wet Detention Cak:s

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Strickland, Bev
From: Dev ne,8ovd
Sent: Friday, June Z7'ZUl4lU:04AK4
To: Strickland, Bev
Subject: please file this
Attachments: Z'0'l4(E|k[reeWrevl3_l5 Sediment Basin Plan (l).pdf,UZlUl4DVVRresponse
|trUUIpdf
Will you please file this email and the two attached files in file 13-1O7O. thanks
From: ]ohnVihB
Sent: Monday, February 1O,2O14 2:02 PM
To: Fox, Tim
Cc: Oevane,Boyd
Subject: RE: Elk Creek at Banner Elk
Tim and Boyd,
Attached isa letter addressing the comments received for the Elk Creek at Banner Elk Project and a revised plan sheet
showing a wet pond instead of the sand filter previously proposed, the wet pond supplement and calculations are
included as well. I will mail hard copies to Raleigh with a more complete set of plans. Please let me know if you have any
questions. Thank you for working with uson this project.
From: Fox, Tim
t ox
Sent: Thursday, January 3U 20144:09PM
To: John Vi|as
Cc:Devane,Boyd
Subject: RE: Elk Creek at Banner Elk
Thanks for the communication and discussion today. An extension is granted until Monday, February 101h.
Uri
Tim Fox
North Carolina Dept. of Environment and Natural Resources
Asheville Regional Office
Division of Water Resources — Water Quality Programs

Notice: Email correspondence to and from this address may be subject to the NC Public Records Law and may be
disclosed to third parties.
From: ]ohnVihB
Sent: Thursday, ]anuary]O 2O14]:52 PM
To: Fox, Tim
Cc: Cranford, Chuck; Oevane, Boyd
Subject: RE: Elk Creek at Banner Elk
From: Fox, Tim
Sent: Tuesda�December �7,ZU13Z:UZPM
To: John Vilas
Cc: Cranford, Chuck; Devane, Boyd
Subject: RE: Elk Creek at Banner Elk

Notice: Email correspondence to and from this address may be subject to the NC Public Records Law and may be
disclosed to third parties.
From: John Vilas [innai.Its.oIhln . inv.:..eco_colrm]
Sent: Tuesday, December 17, 2013 11:59 AM
To: Fox, Tim
Cc: cc iriru.iro. .in f( aoI.coirn; d�. yi_�.[.o_Ir lrm gy.@:?.`..�2IJ oln,inet
Subject: Elk Creek at Banner Elk
Ti m,
On behalf of my client, Elk Creek Development Company of Banner Elk, LLC, I am sending you this request for an
extension to the 12 -19 -13 deadline noted in the Request for More Information letter dated 11 -20 -2013 we received for
the referenced project. We have reviewed all the comments and have been in the process of reviewing the site plan and
revising the stormwater management plan in an effort to address all the comments provided. Given the amount of work
and coordination needed to provide the requested information, and with the holiday season upon us, we would request
an extension until the end of January, 2014.
Please let me know if there are any questions or concerns with this request. Thank you for your help with this project
and have a happy and safe holiday season.
John Vilas
ENV -ECS, Inc.
3764 Rominger Rd.
Banner Elk, NC 28604
ph: 828 - 297 -6946
fax: 828 - 297 -1982
`ohn 421 e11 y- ecs.c0 1n